I'm having problems sending faxes, receiving works fine.
I tested sending faxes to an outside number and sending to our internal 'real' faxmachine, the fax answers, picks up, and then nothing happens, no rx/tx activity on the modem. then a timeout occurs and I get a 'busy' error in the logfile (see below) I used a different non class2 modem as well but exactly the same result, when I twist around cables between faxes en sent with the real fax, receive with hylafax it works fine. So there is no issue with real busy lines.